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Neurophysiology: Nerve and Muscle Impulse Transmission

12 Questions

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Neurophysiology: Nerve and Muscle Impulse Transmission

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Questions and Answers

What is the term for the transmission of the depolarization process along a nerve or muscle fiber?

Nerve impulse (correct)

Muscle impulse

Action potential

Saltatory conduction

What is the function of myelin sheath in myelinated nerve fibers?

Generates action potential

Increases the velocity of impulse transmission (correct)

Causes whole fiber depolarization

Prevents saltatory conduction

In saltatory conduction, where does the nerve impulse jump along the fiber?

Only at the myelin sheath

From node to node (correct)

From Schwann cell to Schwann cell

Randomly along the fiber

What is the advantage of saltatory conduction?

Increases the velocity of impulse transmission Signup and view all the answers

What is the process called when a weak stimulus fails to reach the threshold point to produce automatic regenerative opening of the Na channels and develop an action potential?

Acute subthreshold (local) potentials Signup and view all the answers

What factor decreases nerve excitability by decreasing membrane permeability to sodium ions and simultaneously reducing excitability?

High extracellular fluid calcium ion concentration Signup and view all the answers

Which process describes the automatic regenerative opening of sodium channels due to mechanical disturbance, chemical effects, or passage of electricity through the membrane?

Excitation Signup and view all the answers

What is the special feature of the Na+-K+ ATP pump mentioned in the text?

Its activity is strongly stimulated when excess sodium ions accumulate inside the cell membrane Signup and view all the answers

What is the requirement for continued propagation of an impulse?

The ratio of action potential to threshold for excitation must be greater than 1 Signup and view all the answers

What is the significance of the 'safety factor for propagation'?

It ensures that the spread of depolarization stops Signup and view all the answers

What is responsible for re-establishing the sodium and potassium membrane concentration differences?

Adenosine triphosphate (ATP) energy system Signup and view all the answers

How does the Na+-K+ pump contribute to recharging the nerve fiber?

By using energy derived from the adenosine triphosphate (ATP) energy system Signup and view all the answers